The buckshot that I've tried to use number 4 yes, seems to not wanna go in the cylinder, It seems that it takes a lot more pressure. It's a little bit bigger but I think the lead might be a little harder i'll try it again but I didn't have really great luck the first time and I bought 5 lbs of number 4 LOL. But I have a bunch of black powder shotguns too so it's all good.